Wiseco K636M865 Forged 86.5 mm Pistons for 2008-2015 Mitsubishi Lancer Evo X

Vehicle Fitment

• 2008-2015 Mitsubishi Lancer Evolution X (4B11T, 2.0 L DOHC Turbo)

Features

• Forged from 2618 aerospace-grade aluminum for high strength
• ArmorGlide® skirt coating reduces friction and wear
• Strutted forging enhances rigidity under high RPM
• Dish volume of -4.5 cc for lower compression tuning
• Optimized for performance and forced induction applications
• Includes pre-gapped premium ring pack for reliable sealing
• Floating wrist pins for durability under load
• Designed for severe-duty and race-level builds

Specifications

• Bore diameter: 86.50 mm
• Compression height: 33.25 mm
• Dish volume: -4.5 cc
• Compression ratio: ~9.3:1
• Wrist pin diameter: 23 mm
• Piston material: 2618 forged aluminum alloy
• Recommended ring set: 8650XX pre-gapped
• Piston weight: ~368 g per piston

Included Components

• 4x forged pistons
• 4x wrist pins
• 1x premium ring set (pre-gapped)
• 4x retaining clips / locks

Product Description

The Wiseco K636M865 piston set is engineered for the Mitsubishi Lancer Evolution X 4B11T engine, offering high strength and precision for performance and rebuild applications. The 86.5 mm bore with a 33.25 mm compression height and -4.5 cc dish volume provides a slightly lower compression ratio ideal for turbocharged or high-boost setups.

Constructed from 2618 aerospace-grade aluminum, these pistons feature ArmorGlide® coated skirts to reduce friction and wear, while the strutted forging increases stiffness under high RPM stress. Floating wrist pins and a premium pre-gapped ring pack ensure reliable sealing and durability in severe-duty and race-level builds.

This piston set is ideal for factory-replacement, upgraded, or high-performance engine builds. Proper machining, bore sizing, and ring gap adjustment during installation are recommended to maximize performance and longevity.